62 
VICTORIA MEMORIAL MUSEUM. BULLETIN NO. I 
lobites.” The eyes, too, are separated from the glabella by this 
same roll, a rounded ridge which starts at the neck furrow and 
encircles the glabella, outside the deep furrow. These seem to 
be the principal characters in which Cyphaspis differs from 
Proetus, and the proposed genus has these characters, yet agrees 
with Proetus in lacking the isolated basal glabellar lobes which 
are so prominent a feature in the cephalon of Cyphaspis . 
Haploconus smithi, (Billings). 
Plate VII, figs. 13 and 14. 
Bathyurus smithi , Billings, 1863. Geology of Canada, p. 153, 
fig. 115. — 1865, Palaeozoic Fossils of Canada, Vol. I, 
p. 56. 
This species was founded upon a very small fragment, show- 
ing only the glabella and portions of the fixed cheeks. There 
is now at hand, however, a very beautiful complete specimen, 
collected by Mr. Lawrence M. Lambe, Vertebrate Palaeontologist 
to the Geological Survey, at the typical locality, Peterboro, 
Ontario. The entire specimen is 3 mm. long, and is probably 
not an adult, as it has only 7 segments in the thorax. Except 
for the small number of segments, it does not, however, show 
characters of immaturity. 
Description. — Entire body broadly oval, the cephalon with 
long genai spines which extend back as far as the pygidium. 
Cephalon short, tumid, the glabella forming the highest part. 
Glabella oval, smooth, with faint indications of one pair of fur- 
rows. Glabella surrounded by a deep groove, which is paralleled 
by a rounded ridge which, at the front, intervenes between the 
glabella and the upturned marginal rim. The eyes are ^mall, 
well forward, and separated from the glabella by the ridge just 
mentioned. The facial suture cuts the posterior margin well 
within the genai angle, and reaches the anterior margin in front 
of the eye. The genai angles bear long, rounded spines. 
Thorax with seven segments (in an immature specimen), 
which are bent very abruptly at the sides. Axial lobe narrow. 
